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3rd brake light strobe?


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jayson33 
Copper - Posts: 165
Copper spacespace
Joined: June 12, 2008
Location: Indiana, United States
Posted: February 18, 2010 at 11:26 PM / IP Logged  

3rd brake light strobe? - Last Post -- posted image.

Can anyone tell me If this looks like it will work?

My wife thinks bagging a truck means you kick it in the truck nuts
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: February 19, 2010 at 10:38 PM / IP Logged  
Why shouldn't it? It's been around for years including the LED upgrade.
A later diagram says it corrects the orientation of D3, but that doesn't make sense to me seeing as Q1 is PNP. Then again, a PNP doesn't make sense - shouldn't it be an NPN?
I suspect sentex.ca/~mec1995/circ/motflash to be a better circuit (read the Updates at the bottom). That's referred to from sentex.ca/~mec1995/circ/flashing in turn from sentex.ca/~mec1995/circ/circuits.
jayson33 
Copper - Posts: 165
Copper spacespace
Joined: June 12, 2008
Location: Indiana, United States
Posted: February 20, 2010 at 12:04 AM / IP Logged  
Your's looks alot simpler than the one I have. Thanks
My wife thinks bagging a truck means you kick it in the truck nuts
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: February 20, 2010 at 2:40 AM / IP Logged  
Your welcome.
Did you see that kits were available?
And the article says that it's better than the 555 version, and has no initial delay.
I love the 555, but I learned years ago never to use the dual 556 - it was better using 2 separate 555s. (I did the impossible - an electronic "Halda" - an accurate odometer for Rallying etc; its readout was units of 10 yards/meters. It needed pulse/frequency multiplication. I used one 555 to gate another so one pulse in became about 200 pulses out - similar to the brake flasher. PLLs (Phase Locked Loops) became available later, and now CPUs.)
Not that a 556 is used above, but it can typify dual 555 circuits.
And the 2nd circuit has only one chip (14-pin quad Schmidt NAND) instead of two 555s. The gates (NANDs) do not have the same problems a 555s - ie, high switching transients, different behavior depending on the manufacturer. And they're about the same price (a bit more than a 555, but cheaper than two 555s).
The other thing I like about the 2nd circuit is the revision history - it seems to work. (Note the person that used a battery charger to power it, hence it wouldn't work. That's one for 12volt audiophiles.)
The original twin-555 circuit is a bit vague... (D3 direction, PNP vs NPN etc).
Good luck!

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